A lever is the simplest kind of mechanism. There are three different types of lever. Common examples of each type are the crowbar, the wheelbarrow and the pair of tweezers.
All levers are one of three types, usually called classes. The class of a lever depends on the relative position of the load, effort and fulcrum:
- The load is the object you are trying to move.
- The effort is the force applied to move the load.
- The fulcrum (or pivot) is the point where the load is pivoted.
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